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fragment shader: use color buffer

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This commit is contained in:
Fredrik Robertsen
2025-09-03 15:10:19 +02:00
parent 0fffa641de
commit f6d3e24b8f
3 changed files with 57 additions and 10 deletions
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5
gloom-rs/shaders/simple.frag
View File

@@ -1,8 +1,9 @@
#version 410 core
in vec4 fragment_colors;
out vec4 color;
void main()
{
color = vec4(1.0f, 1.0f, 1.0f, 1.0f);
}
color = fragment_colors;
}

5
gloom-rs/shaders/simple.vert
View File

@@ -1,6 +1,8 @@
#version 410 core
in vec3 position;
layout(location=0) in vec3 position;
layout(location=1) in vec4 vertex_colors;
out vec4 fragment_colors;
// this matrix mirrors over the x-axis and the y-axis simultaneously
uniform mat4 flip = mat4(
@@ -13,4 +15,5 @@ uniform mat4 flip = mat4(
void main()
{
gl_Position = flip * vec4(position, 1.0f);
fragment_colors = vertex_colors;
}

57
gloom-rs/src/main.rs
View File

@@ -53,16 +53,18 @@ fn offset<T>(n: u32) -> *const c_void {
// == // Generate your VAO here
unsafe fn create_vao(vertices: &Vec<f32>, indices: &Vec<u32>) -> u32 {
unsafe fn create_vao(vertices: &Vec<f32>, indices: &Vec<u32>, colors: &Vec<f32>) -> u32 {
// generate a VAO and bind it
let mut vao_id: u32 = 0;
gl::GenVertexArrays(1, &mut vao_id);
gl::BindVertexArray(vao_id);
// -- vertex buffer --
// generate a VBO and bind it
let mut vbo_id: u32 = 0;
gl::GenBuffers(1, &mut vbo_id);
gl::BindBuffer(gl::ARRAY_BUFFER, vbo_id);
let mut vertices_vbo_id: u32 = 0;
gl::GenBuffers(1, &mut vertices_vbo_id);
gl::BindBuffer(gl::ARRAY_BUFFER, vertices_vbo_id);
// fill it with data
gl::BufferData(
@@ -73,8 +75,31 @@ unsafe fn create_vao(vertices: &Vec<f32>, indices: &Vec<u32>) -> u32 {
);
// configure a VAP for the data and enable it
gl::VertexAttribPointer(0, 3, gl::FLOAT, gl::FALSE, size_of::<f32>()*3, ptr::null());
gl::EnableVertexAttribArray(0);
let vertices_index = 0;
gl::VertexAttribPointer(vertices_index, 3, gl::FLOAT, gl::FALSE, size_of::<f32>()*3, ptr::null());
gl::EnableVertexAttribArray(vertices_index);
// -- color buffer --
// generate a VBO and bind it
let mut colors_vbo_id: u32 = 0;
gl::GenBuffers(1, &mut colors_vbo_id);
gl::BindBuffer(gl::ARRAY_BUFFER, colors_vbo_id);
// fill it with data
gl::BufferData(
gl::ARRAY_BUFFER,
byte_size_of_array(colors),
pointer_to_array(colors),
gl::STATIC_DRAW
);
// configure a VAP for the data and enable it
let colors_index = 1;
gl::VertexAttribPointer(colors_index, 4, gl::FLOAT, gl::FALSE, size_of::<f32>()*4, ptr::null());
gl::EnableVertexAttribArray(colors_index);
// -- index buffer --
// generate a IBO and bind it
let mut ibo_id: u32 = 0;
@@ -188,7 +213,25 @@ fn main() {
12,13,14
];
let vao_id = unsafe { create_vao(&vertices, &indices) };
let colors = vec![
1.0, 0.0, 0.0, 1.0,
0.0, 1.0, 0.0, 1.0,
0.0, 0.0, 1.0, 1.0,
1.0, 0.0, 0.0, 1.0,
0.0, 1.0, 0.0, 1.0,
0.0, 0.0, 1.0, 1.0,
1.0, 0.0, 0.0, 1.0,
0.0, 1.0, 0.0, 1.0,
0.0, 0.0, 1.0, 1.0,
1.0, 0.0, 0.0, 1.0,
0.0, 1.0, 0.0, 1.0,
0.0, 0.0, 1.0, 1.0,
1.0, 0.0, 0.0, 1.0,
0.0, 1.0, 0.0, 1.0,
0.0, 0.0, 1.0, 1.0,
];
let vao_id = unsafe { create_vao(&vertices, &indices, &colors) };
// == // Set up your shaders here